1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "compiler/compiler_globals.hpp"
26 #include "interp_masm_x86.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "interpreter/interpreterRuntime.hpp"
29 #include "logging/log.hpp"
30 #include "oops/arrayOop.hpp"
31 #include "oops/markWord.hpp"
32 #include "oops/methodData.hpp"
33 #include "oops/method.hpp"
34 #include "oops/resolvedFieldEntry.hpp"
35 #include "oops/resolvedIndyEntry.hpp"
36 #include "oops/resolvedMethodEntry.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "prims/jvmtiThreadState.hpp"
39 #include "runtime/basicLock.hpp"
40 #include "runtime/frame.inline.hpp"
41 #include "runtime/javaThread.hpp"
42 #include "runtime/safepointMechanism.hpp"
43 #include "runtime/sharedRuntime.hpp"
44 #include "utilities/powerOfTwo.hpp"
45
46 // Implementation of InterpreterMacroAssembler
47
48 void InterpreterMacroAssembler::jump_to_entry(address entry) {
49 assert(entry, "Entry must have been generated by now");
50 jump(RuntimeAddress(entry));
51 }
52
53 void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) {
54 Label update, next, none;
55
56 assert_different_registers(obj, rscratch1, mdo_addr.base(), mdo_addr.index());
57
58 interp_verify_oop(obj, atos);
59
60 testptr(obj, obj);
61 jccb(Assembler::notZero, update);
62 testptr(mdo_addr, TypeEntries::null_seen);
63 jccb(Assembler::notZero, next); // null already seen. Nothing to do anymore.
64 // atomic update to prevent overwriting Klass* with 0
65 lock();
66 orptr(mdo_addr, TypeEntries::null_seen);
67 jmpb(next);
68
69 bind(update);
70 load_klass(obj, obj, rscratch1);
71 mov(rscratch1, obj);
72
73 xorptr(obj, mdo_addr);
74 testptr(obj, TypeEntries::type_klass_mask);
75 jccb(Assembler::zero, next); // klass seen before, nothing to
76 // do. The unknown bit may have been
77 // set already but no need to check.
78
79 testptr(obj, TypeEntries::type_unknown);
80 jccb(Assembler::notZero, next); // already unknown. Nothing to do anymore.
81
82 cmpptr(mdo_addr, 0);
83 jccb(Assembler::equal, none);
84 cmpptr(mdo_addr, TypeEntries::null_seen);
85 jccb(Assembler::equal, none);
86
87 // There is a chance that the checks above (re-reading profiling
88 // data from memory) fail if another thread has just set the
89 // profiling to this obj's klass
90 mov(obj, rscratch1);
91 xorptr(obj, mdo_addr);
92 testptr(obj, TypeEntries::type_klass_mask);
93 jccb(Assembler::zero, next);
94
95 // different than before. Cannot keep accurate profile.
96 orptr(mdo_addr, TypeEntries::type_unknown);
97 jmpb(next);
98
99 bind(none);
100 // first time here. Set profile type.
101 movptr(mdo_addr, obj);
102 #ifdef ASSERT
103 andptr(obj, TypeEntries::type_klass_mask);
104 verify_klass_ptr(obj);
105 #endif
106
107 bind(next);
108 }
109
110 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) {
111 if (!ProfileInterpreter) {
112 return;
113 }
114
115 if (MethodData::profile_arguments() || MethodData::profile_return()) {
116 Label profile_continue;
117
118 test_method_data_pointer(mdp, profile_continue);
119
120 int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size());
121
122 cmpb(Address(mdp, in_bytes(DataLayout::tag_offset()) - off_to_start), is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag);
123 jcc(Assembler::notEqual, profile_continue);
124
125 if (MethodData::profile_arguments()) {
126 Label done;
127 int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset());
128 addptr(mdp, off_to_args);
129
130 for (int i = 0; i < TypeProfileArgsLimit; i++) {
131 if (i > 0 || MethodData::profile_return()) {
132 // If return value type is profiled we may have no argument to profile
133 movptr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args));
134 subl(tmp, i*TypeStackSlotEntries::per_arg_count());
135 cmpl(tmp, TypeStackSlotEntries::per_arg_count());
136 jcc(Assembler::less, done);
137 }
138 movptr(tmp, Address(callee, Method::const_offset()));
139 load_unsigned_short(tmp, Address(tmp, ConstMethod::size_of_parameters_offset()));
140 // stack offset o (zero based) from the start of the argument
141 // list, for n arguments translates into offset n - o - 1 from
142 // the end of the argument list
143 subptr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i))-off_to_args));
144 subl(tmp, 1);
145 Address arg_addr = argument_address(tmp);
146 movptr(tmp, arg_addr);
147
148 Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i))-off_to_args);
149 profile_obj_type(tmp, mdo_arg_addr);
150
151 int to_add = in_bytes(TypeStackSlotEntries::per_arg_size());
152 addptr(mdp, to_add);
153 off_to_args += to_add;
154 }
155
156 if (MethodData::profile_return()) {
157 movptr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args));
158 subl(tmp, TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count());
159 }
160
161 bind(done);
162
163 if (MethodData::profile_return()) {
164 // We're right after the type profile for the last
165 // argument. tmp is the number of cells left in the
166 // CallTypeData/VirtualCallTypeData to reach its end. Non null
167 // if there's a return to profile.
168 assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type");
169 shll(tmp, log2i_exact((int)DataLayout::cell_size));
170 addptr(mdp, tmp);
171 }
172 movptr(Address(rbp, frame::interpreter_frame_mdp_offset * wordSize), mdp);
173 } else {
174 assert(MethodData::profile_return(), "either profile call args or call ret");
175 update_mdp_by_constant(mdp, in_bytes(TypeEntriesAtCall::return_only_size()));
176 }
177
178 // mdp points right after the end of the
179 // CallTypeData/VirtualCallTypeData, right after the cells for the
180 // return value type if there's one
181
182 bind(profile_continue);
183 }
184 }
185
186 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) {
187 assert_different_registers(mdp, ret, tmp, _bcp_register);
188 if (ProfileInterpreter && MethodData::profile_return()) {
189 Label profile_continue;
190
191 test_method_data_pointer(mdp, profile_continue);
192
193 if (MethodData::profile_return_jsr292_only()) {
194 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
195
196 // If we don't profile all invoke bytecodes we must make sure
197 // it's a bytecode we indeed profile. We can't go back to the
198 // beginning of the ProfileData we intend to update to check its
199 // type because we're right after it and we don't known its
200 // length
201 Label do_profile;
202 cmpb(Address(_bcp_register, 0), Bytecodes::_invokedynamic);
203 jcc(Assembler::equal, do_profile);
204 cmpb(Address(_bcp_register, 0), Bytecodes::_invokehandle);
205 jcc(Assembler::equal, do_profile);
206 get_method(tmp);
207 cmpw(Address(tmp, Method::intrinsic_id_offset()), static_cast<int>(vmIntrinsics::_compiledLambdaForm));
208 jcc(Assembler::notEqual, profile_continue);
209
210 bind(do_profile);
211 }
212
213 Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size()));
214 mov(tmp, ret);
215 profile_obj_type(tmp, mdo_ret_addr);
216
217 bind(profile_continue);
218 }
219 }
220
221 void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) {
222 if (ProfileInterpreter && MethodData::profile_parameters()) {
223 Label profile_continue;
224
225 test_method_data_pointer(mdp, profile_continue);
226
227 // Load the offset of the area within the MDO used for
228 // parameters. If it's negative we're not profiling any parameters
229 movl(tmp1, Address(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset())));
230 testl(tmp1, tmp1);
231 jcc(Assembler::negative, profile_continue);
232
233 // Compute a pointer to the area for parameters from the offset
234 // and move the pointer to the slot for the last
235 // parameters. Collect profiling from last parameter down.
236 // mdo start + parameters offset + array length - 1
237 addptr(mdp, tmp1);
238 movptr(tmp1, Address(mdp, ArrayData::array_len_offset()));
239 decrement(tmp1, TypeStackSlotEntries::per_arg_count());
240
241 Label loop;
242 bind(loop);
243
244 int off_base = in_bytes(ParametersTypeData::stack_slot_offset(0));
245 int type_base = in_bytes(ParametersTypeData::type_offset(0));
246 Address::ScaleFactor per_arg_scale = Address::times(DataLayout::cell_size);
247 Address arg_off(mdp, tmp1, per_arg_scale, off_base);
248 Address arg_type(mdp, tmp1, per_arg_scale, type_base);
249
250 // load offset on the stack from the slot for this parameter
251 movptr(tmp2, arg_off);
252 negptr(tmp2);
253 // read the parameter from the local area
254 movptr(tmp2, Address(_locals_register, tmp2, Interpreter::stackElementScale()));
255
256 // profile the parameter
257 profile_obj_type(tmp2, arg_type);
258
259 // go to next parameter
260 decrement(tmp1, TypeStackSlotEntries::per_arg_count());
261 jcc(Assembler::positive, loop);
262
263 bind(profile_continue);
264 }
265 }
266
267 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point,
268 int number_of_arguments) {
269 // interpreter specific
270 //
271 // Note: No need to save/restore bcp & locals registers
272 // since these are callee saved registers and no blocking/
273 // GC can happen in leaf calls.
274 // Further Note: DO NOT save/restore bcp/locals. If a caller has
275 // already saved them so that it can use rsi/rdi as temporaries
276 // then a save/restore here will DESTROY the copy the caller
277 // saved! There used to be a save_bcp() that only happened in
278 // the ASSERT path (no restore_bcp). Which caused bizarre failures
279 // when jvm built with ASSERTs.
280 #ifdef ASSERT
281 {
282 Label L;
283 cmpptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);
284 jcc(Assembler::equal, L);
285 stop("InterpreterMacroAssembler::call_VM_leaf_base:"
286 " last_sp != null");
287 bind(L);
288 }
289 #endif
290 // super call
291 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments);
292 // interpreter specific
293 // LP64: Used to ASSERT that r13/r14 were equal to frame's bcp/locals
294 // but since they may not have been saved (and we don't want to
295 // save them here (see note above) the assert is invalid.
296 }
297
298 void InterpreterMacroAssembler::call_VM_base(Register oop_result,
299 Register last_java_sp,
300 address entry_point,
301 int number_of_arguments,
302 bool check_exceptions) {
303 // interpreter specific
304 //
305 // Note: Could avoid restoring locals ptr (callee saved) - however doesn't
306 // really make a difference for these runtime calls, since they are
307 // slow anyway. Btw., bcp must be saved/restored since it may change
308 // due to GC.
309 save_bcp();
310 #ifdef ASSERT
311 {
312 Label L;
313 cmpptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);
314 jcc(Assembler::equal, L);
315 stop("InterpreterMacroAssembler::call_VM_base:"
316 " last_sp isn't null");
317 bind(L);
318 }
319 #endif /* ASSERT */
320 // super call
321 MacroAssembler::call_VM_base(oop_result, last_java_sp,
322 entry_point, number_of_arguments,
323 check_exceptions);
324 // interpreter specific
325 restore_bcp();
326 restore_locals();
327 }
328
329 void InterpreterMacroAssembler::call_VM_preemptable_helper(Register oop_result,
330 address entry_point,
331 int number_of_arguments,
332 bool check_exceptions) {
333 Label resume_pc, not_preempted;
334
335 #ifdef ASSERT
336 {
337 Label L;
338 cmpptr(Address(r15_thread, JavaThread::preempt_alternate_return_offset()), NULL_WORD);
339 jcc(Assembler::equal, L);
340 stop("Should not have alternate return address set");
341 bind(L);
342 }
343 #endif /* ASSERT */
344
345 // Force freeze slow path.
346 push_cont_fastpath();
347
348 // Make VM call. In case of preemption set last_pc to the one we want to resume to.
349 // Note: call_VM_helper requires last_Java_pc for anchor to be at the top of the stack.
350 lea(rscratch1, resume_pc);
351 push(rscratch1);
352 MacroAssembler::call_VM_helper(oop_result, entry_point, number_of_arguments, check_exceptions);
353 pop(rscratch1);
354
355 pop_cont_fastpath();
356
357 // Check if preempted.
358 movptr(rscratch1, Address(r15_thread, JavaThread::preempt_alternate_return_offset()));
359 cmpptr(rscratch1, NULL_WORD);
360 jccb(Assembler::zero, not_preempted);
361 movptr(Address(r15_thread, JavaThread::preempt_alternate_return_offset()), NULL_WORD);
362 jmp(rscratch1);
363
364 // In case of preemption, this is where we will resume once we finally acquire the monitor.
365 bind(resume_pc);
366 restore_after_resume(false /* is_native */);
367
368 if (check_exceptions) {
369 // check for pending exceptions (java_thread is set upon return)
370 cmpptr(Address(r15_thread, Thread::pending_exception_offset()), NULL_WORD);
371 Label ok;
372 jcc(Assembler::equal, ok);
373 jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
374 bind(ok);
375 }
376
377 // get oop result if there is one and reset the value in the thread
378 if (oop_result->is_valid()) {
379 get_vm_result_oop(oop_result);
380 }
381
382 bind(not_preempted);
383 }
384
385 static void pass_arg1(MacroAssembler* masm, Register arg) {
386 if (c_rarg1 != arg ) {
387 masm->mov(c_rarg1, arg);
388 }
389 }
390
391 static void pass_arg2(MacroAssembler* masm, Register arg) {
392 if (c_rarg2 != arg ) {
393 masm->mov(c_rarg2, arg);
394 }
395 }
396
397 void InterpreterMacroAssembler::call_VM_preemptable(Register oop_result,
398 address entry_point,
399 Register arg_1,
400 bool check_exceptions) {
401 pass_arg1(this, arg_1);
402 call_VM_preemptable_helper(oop_result, entry_point, 1, check_exceptions);
403 }
404
405 void InterpreterMacroAssembler::call_VM_preemptable(Register oop_result,
406 address entry_point,
407 Register arg_1,
408 Register arg_2,
409 bool check_exceptions) {
410 LP64_ONLY(assert_different_registers(arg_1, c_rarg2));
411 pass_arg2(this, arg_2);
412 pass_arg1(this, arg_1);
413 call_VM_preemptable_helper(oop_result, entry_point, 2, check_exceptions);
414 }
415
416 void InterpreterMacroAssembler::restore_after_resume(bool is_native) {
417 lea(rscratch1, ExternalAddress(Interpreter::cont_resume_interpreter_adapter()));
418 call(rscratch1);
419 if (is_native) {
420 // On resume we need to set up stack as expected.
421 push(dtos);
422 push(ltos);
423 }
424 }
425
426 void InterpreterMacroAssembler::check_and_handle_popframe() {
427 if (JvmtiExport::can_pop_frame()) {
428 Label L;
429 // Initiate popframe handling only if it is not already being
430 // processed. If the flag has the popframe_processing bit set, it
431 // means that this code is called *during* popframe handling - we
432 // don't want to reenter.
433 // This method is only called just after the call into the vm in
434 // call_VM_base, so the arg registers are available.
435 Register pop_cond = c_rarg0;
436 movl(pop_cond, Address(r15_thread, JavaThread::popframe_condition_offset()));
437 testl(pop_cond, JavaThread::popframe_pending_bit);
438 jcc(Assembler::zero, L);
439 testl(pop_cond, JavaThread::popframe_processing_bit);
440 jcc(Assembler::notZero, L);
441 // Call Interpreter::remove_activation_preserving_args_entry() to get the
442 // address of the same-named entrypoint in the generated interpreter code.
443 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry));
444 jmp(rax);
445 bind(L);
446 }
447 }
448
449 void InterpreterMacroAssembler::load_earlyret_value(TosState state) {
450 movptr(rcx, Address(r15_thread, JavaThread::jvmti_thread_state_offset()));
451 const Address tos_addr(rcx, JvmtiThreadState::earlyret_tos_offset());
452 const Address oop_addr(rcx, JvmtiThreadState::earlyret_oop_offset());
453 const Address val_addr(rcx, JvmtiThreadState::earlyret_value_offset());
454
455 switch (state) {
456 case atos: movptr(rax, oop_addr);
457 movptr(oop_addr, NULL_WORD);
458 interp_verify_oop(rax, state); break;
459 case ltos: movptr(rax, val_addr); break;
460 case btos: // fall through
461 case ztos: // fall through
462 case ctos: // fall through
463 case stos: // fall through
464 case itos: movl(rax, val_addr); break;
465 case ftos: movflt(xmm0, val_addr); break;
466 case dtos: movdbl(xmm0, val_addr); break;
467 case vtos: /* nothing to do */ break;
468 default : ShouldNotReachHere();
469 }
470
471 // Clean up tos value in the thread object
472 movl(tos_addr, ilgl);
473 movptr(val_addr, NULL_WORD);
474 }
475
476
477 void InterpreterMacroAssembler::check_and_handle_earlyret() {
478 if (JvmtiExport::can_force_early_return()) {
479 Label L;
480 Register tmp = c_rarg0;
481 Register rthread = r15_thread;
482
483 movptr(tmp, Address(rthread, JavaThread::jvmti_thread_state_offset()));
484 testptr(tmp, tmp);
485 jcc(Assembler::zero, L); // if (thread->jvmti_thread_state() == nullptr) exit;
486
487 // Initiate earlyret handling only if it is not already being processed.
488 // If the flag has the earlyret_processing bit set, it means that this code
489 // is called *during* earlyret handling - we don't want to reenter.
490 movl(tmp, Address(tmp, JvmtiThreadState::earlyret_state_offset()));
491 cmpl(tmp, JvmtiThreadState::earlyret_pending);
492 jcc(Assembler::notEqual, L);
493
494 // Call Interpreter::remove_activation_early_entry() to get the address of the
495 // same-named entrypoint in the generated interpreter code.
496 movptr(tmp, Address(rthread, JavaThread::jvmti_thread_state_offset()));
497 movl(tmp, Address(tmp, JvmtiThreadState::earlyret_tos_offset()));
498 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), tmp);
499 jmp(rax);
500 bind(L);
501 }
502 }
503
504 void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp(Register reg, int bcp_offset) {
505 assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode");
506 load_unsigned_short(reg, Address(_bcp_register, bcp_offset));
507 bswapl(reg);
508 shrl(reg, 16);
509 }
510
511 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register index,
512 int bcp_offset,
513 size_t index_size) {
514 assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");
515 if (index_size == sizeof(u2)) {
516 load_unsigned_short(index, Address(_bcp_register, bcp_offset));
517 } else if (index_size == sizeof(u4)) {
518 movl(index, Address(_bcp_register, bcp_offset));
519 } else if (index_size == sizeof(u1)) {
520 load_unsigned_byte(index, Address(_bcp_register, bcp_offset));
521 } else {
522 ShouldNotReachHere();
523 }
524 }
525
526 // Load object from cpool->resolved_references(index)
527 void InterpreterMacroAssembler::load_resolved_reference_at_index(Register result,
528 Register index,
529 Register tmp) {
530 assert_different_registers(result, index);
531
532 get_constant_pool(result);
533 // load pointer for resolved_references[] objArray
534 movptr(result, Address(result, ConstantPool::cache_offset()));
535 movptr(result, Address(result, ConstantPoolCache::resolved_references_offset()));
536 resolve_oop_handle(result, tmp);
537 load_heap_oop(result, Address(result, index,
538 UseCompressedOops ? Address::times_4 : Address::times_ptr,
539 arrayOopDesc::base_offset_in_bytes(T_OBJECT)), tmp);
540 }
541
542 // load cpool->resolved_klass_at(index)
543 void InterpreterMacroAssembler::load_resolved_klass_at_index(Register klass,
544 Register cpool,
545 Register index) {
546 assert_different_registers(cpool, index);
547
548 movw(index, Address(cpool, index, Address::times_ptr, sizeof(ConstantPool)));
549 Register resolved_klasses = cpool;
550 movptr(resolved_klasses, Address(cpool, ConstantPool::resolved_klasses_offset()));
551 movptr(klass, Address(resolved_klasses, index, Address::times_ptr, Array<Klass*>::base_offset_in_bytes()));
552 }
553
554 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a
555 // subtype of super_klass.
556 //
557 // Args:
558 // rax: superklass
559 // Rsub_klass: subklass
560 //
561 // Kills:
562 // rcx, rdi
563 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,
564 Label& ok_is_subtype) {
565 assert(Rsub_klass != rax, "rax holds superklass");
566 LP64_ONLY(assert(Rsub_klass != r14, "r14 holds locals");)
567 LP64_ONLY(assert(Rsub_klass != r13, "r13 holds bcp");)
568 assert(Rsub_klass != rcx, "rcx holds 2ndary super array length");
569 assert(Rsub_klass != rdi, "rdi holds 2ndary super array scan ptr");
570
571 // Profile the not-null value's klass.
572 profile_typecheck(rcx, Rsub_klass, rdi); // blows rcx, reloads rdi
573
574 // Do the check.
575 check_klass_subtype(Rsub_klass, rax, rcx, ok_is_subtype); // blows rcx
576 }
577
578
579 // Java Expression Stack
580
581 void InterpreterMacroAssembler::pop_ptr(Register r) {
582 pop(r);
583 }
584
585 void InterpreterMacroAssembler::push_ptr(Register r) {
586 push(r);
587 }
588
589 void InterpreterMacroAssembler::push_i(Register r) {
590 push(r);
591 }
592
593 void InterpreterMacroAssembler::push_i_or_ptr(Register r) {
594 push(r);
595 }
596
597 void InterpreterMacroAssembler::push_f(XMMRegister r) {
598 subptr(rsp, wordSize);
599 movflt(Address(rsp, 0), r);
600 }
601
602 void InterpreterMacroAssembler::pop_f(XMMRegister r) {
603 movflt(r, Address(rsp, 0));
604 addptr(rsp, wordSize);
605 }
606
607 void InterpreterMacroAssembler::push_d(XMMRegister r) {
608 subptr(rsp, 2 * wordSize);
609 movdbl(Address(rsp, 0), r);
610 }
611
612 void InterpreterMacroAssembler::pop_d(XMMRegister r) {
613 movdbl(r, Address(rsp, 0));
614 addptr(rsp, 2 * Interpreter::stackElementSize);
615 }
616
617 void InterpreterMacroAssembler::pop_i(Register r) {
618 // XXX can't use pop currently, upper half non clean
619 movl(r, Address(rsp, 0));
620 addptr(rsp, wordSize);
621 }
622
623 void InterpreterMacroAssembler::pop_l(Register r) {
624 movq(r, Address(rsp, 0));
625 addptr(rsp, 2 * Interpreter::stackElementSize);
626 }
627
628 void InterpreterMacroAssembler::push_l(Register r) {
629 subptr(rsp, 2 * wordSize);
630 movptr(Address(rsp, Interpreter::expr_offset_in_bytes(0)), r );
631 movptr(Address(rsp, Interpreter::expr_offset_in_bytes(1)), NULL_WORD );
632 }
633
634 void InterpreterMacroAssembler::pop(TosState state) {
635 switch (state) {
636 case atos: pop_ptr(); break;
637 case btos:
638 case ztos:
639 case ctos:
640 case stos:
641 case itos: pop_i(); break;
642 case ltos: pop_l(); break;
643 case ftos: pop_f(xmm0); break;
644 case dtos: pop_d(xmm0); break;
645 case vtos: /* nothing to do */ break;
646 default: ShouldNotReachHere();
647 }
648 interp_verify_oop(rax, state);
649 }
650
651 void InterpreterMacroAssembler::push(TosState state) {
652 interp_verify_oop(rax, state);
653 switch (state) {
654 case atos: push_ptr(); break;
655 case btos:
656 case ztos:
657 case ctos:
658 case stos:
659 case itos: push_i(); break;
660 case ltos: push_l(); break;
661 case ftos: push_f(xmm0); break;
662 case dtos: push_d(xmm0); break;
663 case vtos: /* nothing to do */ break;
664 default : ShouldNotReachHere();
665 }
666 }
667
668 // Helpers for swap and dup
669 void InterpreterMacroAssembler::load_ptr(int n, Register val) {
670 movptr(val, Address(rsp, Interpreter::expr_offset_in_bytes(n)));
671 }
672
673 void InterpreterMacroAssembler::store_ptr(int n, Register val) {
674 movptr(Address(rsp, Interpreter::expr_offset_in_bytes(n)), val);
675 }
676
677
678 void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() {
679 // set sender sp
680 lea(_bcp_register, Address(rsp, wordSize));
681 // record last_sp
682 mov(rcx, _bcp_register);
683 subptr(rcx, rbp);
684 sarptr(rcx, LogBytesPerWord);
685 movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), rcx);
686 }
687
688
689 // Jump to from_interpreted entry of a call unless single stepping is possible
690 // in this thread in which case we must call the i2i entry
691 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
692 prepare_to_jump_from_interpreted();
693
694 if (JvmtiExport::can_post_interpreter_events()) {
695 Label run_compiled_code;
696 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
697 // compiled code in threads for which the event is enabled. Check here for
698 // interp_only_mode if these events CAN be enabled.
699 // interp_only is an int, on little endian it is sufficient to test the byte only
700 // Is a cmpl faster?
701 cmpb(Address(r15_thread, JavaThread::interp_only_mode_offset()), 0);
702 jccb(Assembler::zero, run_compiled_code);
703 jmp(Address(method, Method::interpreter_entry_offset()));
704 bind(run_compiled_code);
705 }
706
707 jmp(Address(method, Method::from_interpreted_offset()));
708 }
709
710 // The following two routines provide a hook so that an implementation
711 // can schedule the dispatch in two parts. x86 does not do this.
712 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) {
713 // Nothing x86 specific to be done here
714 }
715
716 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) {
717 dispatch_next(state, step);
718 }
719
720 void InterpreterMacroAssembler::dispatch_base(TosState state,
721 address* table,
722 bool verifyoop,
723 bool generate_poll) {
724 if (VerifyActivationFrameSize) {
725 Label L;
726 mov(rcx, rbp);
727 subptr(rcx, rsp);
728 int32_t min_frame_size =
729 (frame::link_offset - frame::interpreter_frame_initial_sp_offset) *
730 wordSize;
731 cmpptr(rcx, min_frame_size);
732 jcc(Assembler::greaterEqual, L);
733 stop("broken stack frame");
734 bind(L);
735 }
736 if (verifyoop) {
737 interp_verify_oop(rax, state);
738 }
739
740 address* const safepoint_table = Interpreter::safept_table(state);
741 Label no_safepoint, dispatch;
742 if (table != safepoint_table && generate_poll) {
743 NOT_PRODUCT(block_comment("Thread-local Safepoint poll"));
744 testb(Address(r15_thread, JavaThread::polling_word_offset()), SafepointMechanism::poll_bit());
745
746 jccb(Assembler::zero, no_safepoint);
747 lea(rscratch1, ExternalAddress((address)safepoint_table));
748 jmpb(dispatch);
749 }
750
751 bind(no_safepoint);
752 lea(rscratch1, ExternalAddress((address)table));
753 bind(dispatch);
754 jmp(Address(rscratch1, rbx, Address::times_8));
755 }
756
757 void InterpreterMacroAssembler::dispatch_only(TosState state, bool generate_poll) {
758 dispatch_base(state, Interpreter::dispatch_table(state), true, generate_poll);
759 }
760
761 void InterpreterMacroAssembler::dispatch_only_normal(TosState state) {
762 dispatch_base(state, Interpreter::normal_table(state));
763 }
764
765 void InterpreterMacroAssembler::dispatch_only_noverify(TosState state) {
766 dispatch_base(state, Interpreter::normal_table(state), false);
767 }
768
769
770 void InterpreterMacroAssembler::dispatch_next(TosState state, int step, bool generate_poll) {
771 // load next bytecode (load before advancing _bcp_register to prevent AGI)
772 load_unsigned_byte(rbx, Address(_bcp_register, step));
773 // advance _bcp_register
774 increment(_bcp_register, step);
775 dispatch_base(state, Interpreter::dispatch_table(state), true, generate_poll);
776 }
777
778 void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) {
779 // load current bytecode
780 load_unsigned_byte(rbx, Address(_bcp_register, 0));
781 dispatch_base(state, table);
782 }
783
784 void InterpreterMacroAssembler::narrow(Register result) {
785
786 // Get method->_constMethod->_result_type
787 movptr(rcx, Address(rbp, frame::interpreter_frame_method_offset * wordSize));
788 movptr(rcx, Address(rcx, Method::const_offset()));
789 load_unsigned_byte(rcx, Address(rcx, ConstMethod::result_type_offset()));
790
791 Label done, notBool, notByte, notChar;
792
793 // common case first
794 cmpl(rcx, T_INT);
795 jcc(Assembler::equal, done);
796
797 // mask integer result to narrower return type.
798 cmpl(rcx, T_BOOLEAN);
799 jcc(Assembler::notEqual, notBool);
800 andl(result, 0x1);
801 jmp(done);
802
803 bind(notBool);
804 cmpl(rcx, T_BYTE);
805 jcc(Assembler::notEqual, notByte);
806 movsbl(result, result);
807 jmp(done);
808
809 bind(notByte);
810 cmpl(rcx, T_CHAR);
811 jcc(Assembler::notEqual, notChar);
812 movzwl(result, result);
813 jmp(done);
814
815 bind(notChar);
816 // cmpl(rcx, T_SHORT); // all that's left
817 // jcc(Assembler::notEqual, done);
818 movswl(result, result);
819
820 // Nothing to do for T_INT
821 bind(done);
822 }
823
824 // remove activation
825 //
826 // Unlock the receiver if this is a synchronized method.
827 // Unlock any Java monitors from synchronized blocks.
828 // Apply stack watermark barrier.
829 // Notify JVMTI.
830 // Remove the activation from the stack.
831 //
832 // If there are locked Java monitors
833 // If throw_monitor_exception
834 // throws IllegalMonitorStateException
835 // Else if install_monitor_exception
836 // installs IllegalMonitorStateException
837 // Else
838 // no error processing
839 void InterpreterMacroAssembler::remove_activation(TosState state,
840 Register ret_addr,
841 bool throw_monitor_exception,
842 bool install_monitor_exception,
843 bool notify_jvmdi) {
844 // Note: Registers rdx xmm0 may be in use for the
845 // result check if synchronized method
846 Label unlocked, unlock, no_unlock;
847
848 const Register rthread = r15_thread;
849 const Register robj = c_rarg1;
850 const Register rmon = c_rarg1;
851
852 // get the value of _do_not_unlock_if_synchronized into rdx
853 const Address do_not_unlock_if_synchronized(rthread,
854 in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
855 movbool(rbx, do_not_unlock_if_synchronized);
856 movbool(do_not_unlock_if_synchronized, false); // reset the flag
857
858 // get method access flags
859 movptr(rcx, Address(rbp, frame::interpreter_frame_method_offset * wordSize));
860 load_unsigned_short(rcx, Address(rcx, Method::access_flags_offset()));
861 testl(rcx, JVM_ACC_SYNCHRONIZED);
862 jcc(Assembler::zero, unlocked);
863
864 // Don't unlock anything if the _do_not_unlock_if_synchronized flag
865 // is set.
866 testbool(rbx);
867 jcc(Assembler::notZero, no_unlock);
868
869 // unlock monitor
870 push(state); // save result
871
872 // BasicObjectLock will be first in list, since this is a
873 // synchronized method. However, need to check that the object has
874 // not been unlocked by an explicit monitorexit bytecode.
875 const Address monitor(rbp, frame::interpreter_frame_initial_sp_offset *
876 wordSize - (int) sizeof(BasicObjectLock));
877 // We use c_rarg1/rdx so that if we go slow path it will be the correct
878 // register for unlock_object to pass to VM directly
879 lea(robj, monitor); // address of first monitor
880
881 movptr(rax, Address(robj, BasicObjectLock::obj_offset()));
882 testptr(rax, rax);
883 jcc(Assembler::notZero, unlock);
884
885 pop(state);
886 if (throw_monitor_exception) {
887 // Entry already unlocked, need to throw exception
888 call_VM(noreg, CAST_FROM_FN_PTR(address,
889 InterpreterRuntime::throw_illegal_monitor_state_exception));
890 should_not_reach_here();
891 } else {
892 // Monitor already unlocked during a stack unroll. If requested,
893 // install an illegal_monitor_state_exception. Continue with
894 // stack unrolling.
895 if (install_monitor_exception) {
896 call_VM(noreg, CAST_FROM_FN_PTR(address,
897 InterpreterRuntime::new_illegal_monitor_state_exception));
898 }
899 jmp(unlocked);
900 }
901
902 bind(unlock);
903 unlock_object(robj);
904 pop(state);
905
906 // Check that for block-structured locking (i.e., that all locked
907 // objects has been unlocked)
908 bind(unlocked);
909
910 // rax, rdx: Might contain return value
911
912 // Check that all monitors are unlocked
913 {
914 Label loop, exception, entry, restart;
915 const int entry_size = frame::interpreter_frame_monitor_size_in_bytes();
916 const Address monitor_block_top(
917 rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
918 const Address monitor_block_bot(
919 rbp, frame::interpreter_frame_initial_sp_offset * wordSize);
920
921 bind(restart);
922 // We use c_rarg1 so that if we go slow path it will be the correct
923 // register for unlock_object to pass to VM directly
924 movptr(rmon, monitor_block_top); // derelativize pointer
925 lea(rmon, Address(rbp, rmon, Address::times_ptr));
926 // c_rarg1 points to current entry, starting with top-most entry
927
928 lea(rbx, monitor_block_bot); // points to word before bottom of
929 // monitor block
930 jmp(entry);
931
932 // Entry already locked, need to throw exception
933 bind(exception);
934
935 if (throw_monitor_exception) {
936 // Throw exception
937 MacroAssembler::call_VM(noreg,
938 CAST_FROM_FN_PTR(address, InterpreterRuntime::
939 throw_illegal_monitor_state_exception));
940 should_not_reach_here();
941 } else {
942 // Stack unrolling. Unlock object and install illegal_monitor_exception.
943 // Unlock does not block, so don't have to worry about the frame.
944 // We don't have to preserve c_rarg1 since we are going to throw an exception.
945
946 push(state);
947 mov(robj, rmon); // nop if robj and rmon are the same
948 unlock_object(robj);
949 pop(state);
950
951 if (install_monitor_exception) {
952 call_VM(noreg, CAST_FROM_FN_PTR(address,
953 InterpreterRuntime::
954 new_illegal_monitor_state_exception));
955 }
956
957 jmp(restart);
958 }
959
960 bind(loop);
961 // check if current entry is used
962 cmpptr(Address(rmon, BasicObjectLock::obj_offset()), NULL_WORD);
963 jcc(Assembler::notEqual, exception);
964
965 addptr(rmon, entry_size); // otherwise advance to next entry
966 bind(entry);
967 cmpptr(rmon, rbx); // check if bottom reached
968 jcc(Assembler::notEqual, loop); // if not at bottom then check this entry
969 }
970
971 bind(no_unlock);
972
973 JFR_ONLY(enter_jfr_critical_section();)
974
975 // The below poll is for the stack watermark barrier. It allows fixing up frames lazily,
976 // that would normally not be safe to use. Such bad returns into unsafe territory of
977 // the stack, will call InterpreterRuntime::at_unwind.
978 Label slow_path;
979 Label fast_path;
980 safepoint_poll(slow_path, true /* at_return */, false /* in_nmethod */);
981 jmp(fast_path);
982 bind(slow_path);
983 push(state);
984 set_last_Java_frame(noreg, rbp, (address)pc(), rscratch1);
985 super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::at_unwind), r15_thread);
986 reset_last_Java_frame(true);
987 pop(state);
988 bind(fast_path);
989
990 // JVMTI support. Make sure the safepoint poll test is issued prior.
991 if (notify_jvmdi) {
992 notify_method_exit(state, NotifyJVMTI); // preserve TOSCA
993 } else {
994 notify_method_exit(state, SkipNotifyJVMTI); // preserve TOSCA
995 }
996
997 // remove activation
998 // get sender sp
999 movptr(rbx,
1000 Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize));
1001 if (StackReservedPages > 0) {
1002 // testing if reserved zone needs to be re-enabled
1003 Register rthread = r15_thread;
1004 Label no_reserved_zone_enabling;
1005
1006 // check if already enabled - if so no re-enabling needed
1007 assert(sizeof(StackOverflow::StackGuardState) == 4, "unexpected size");
1008 cmpl(Address(rthread, JavaThread::stack_guard_state_offset()), StackOverflow::stack_guard_enabled);
1009 jcc(Assembler::equal, no_reserved_zone_enabling);
1010
1011 cmpptr(rbx, Address(rthread, JavaThread::reserved_stack_activation_offset()));
1012 jcc(Assembler::lessEqual, no_reserved_zone_enabling);
1013
1014 JFR_ONLY(leave_jfr_critical_section();)
1015
1016 call_VM_leaf(
1017 CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), rthread);
1018 call_VM(noreg, CAST_FROM_FN_PTR(address,
1019 InterpreterRuntime::throw_delayed_StackOverflowError));
1020 should_not_reach_here();
1021
1022 bind(no_reserved_zone_enabling);
1023 }
1024
1025 leave(); // remove frame anchor
1026
1027 JFR_ONLY(leave_jfr_critical_section();)
1028
1029 pop(ret_addr); // get return address
1030 mov(rsp, rbx); // set sp to sender sp
1031 pop_cont_fastpath();
1032
1033 }
1034
1035 #if INCLUDE_JFR
1036 void InterpreterMacroAssembler::enter_jfr_critical_section() {
1037 const Address sampling_critical_section(r15_thread, in_bytes(SAMPLING_CRITICAL_SECTION_OFFSET_JFR));
1038 movbool(sampling_critical_section, true);
1039 }
1040
1041 void InterpreterMacroAssembler::leave_jfr_critical_section() {
1042 const Address sampling_critical_section(r15_thread, in_bytes(SAMPLING_CRITICAL_SECTION_OFFSET_JFR));
1043 movbool(sampling_critical_section, false);
1044 }
1045 #endif // INCLUDE_JFR
1046
1047 void InterpreterMacroAssembler::get_method_counters(Register method,
1048 Register mcs, Label& skip) {
1049 Label has_counters;
1050 movptr(mcs, Address(method, Method::method_counters_offset()));
1051 testptr(mcs, mcs);
1052 jcc(Assembler::notZero, has_counters);
1053 call_VM(noreg, CAST_FROM_FN_PTR(address,
1054 InterpreterRuntime::build_method_counters), method);
1055 movptr(mcs, Address(method,Method::method_counters_offset()));
1056 testptr(mcs, mcs);
1057 jcc(Assembler::zero, skip); // No MethodCounters allocated, OutOfMemory
1058 bind(has_counters);
1059 }
1060
1061
1062 // Lock object
1063 //
1064 // Args:
1065 // rdx, c_rarg1: BasicObjectLock to be used for locking
1066 //
1067 // Kills:
1068 // rax, rbx
1069 void InterpreterMacroAssembler::lock_object(Register lock_reg) {
1070 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1");
1071
1072 if (LockingMode == LM_MONITOR) {
1073 call_VM_preemptable(noreg,
1074 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
1075 lock_reg);
1076 } else {
1077 Label count_locking, done, slow_case;
1078
1079 const Register swap_reg = rax; // Must use rax for cmpxchg instruction
1080 const Register tmp_reg = rbx;
1081 const Register obj_reg = c_rarg3; // Will contain the oop
1082 const Register rklass_decode_tmp = rscratch1;
1083
1084 const int obj_offset = in_bytes(BasicObjectLock::obj_offset());
1085 const int lock_offset = in_bytes(BasicObjectLock::lock_offset());
1086 const int mark_offset = lock_offset +
1087 BasicLock::displaced_header_offset_in_bytes();
1088
1089 // Load object pointer into obj_reg
1090 movptr(obj_reg, Address(lock_reg, obj_offset));
1091
1092 if (LockingMode == LM_LIGHTWEIGHT) {
1093 lightweight_lock(lock_reg, obj_reg, swap_reg, tmp_reg, slow_case);
1094 } else if (LockingMode == LM_LEGACY) {
1095 if (DiagnoseSyncOnValueBasedClasses != 0) {
1096 load_klass(tmp_reg, obj_reg, rklass_decode_tmp);
1097 testb(Address(tmp_reg, Klass::misc_flags_offset()), KlassFlags::_misc_is_value_based_class);
1098 jcc(Assembler::notZero, slow_case);
1099 }
1100
1101 // Load immediate 1 into swap_reg %rax
1102 movl(swap_reg, 1);
1103
1104 // Load (object->mark() | 1) into swap_reg %rax
1105 orptr(swap_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
1106
1107 // Save (object->mark() | 1) into BasicLock's displaced header
1108 movptr(Address(lock_reg, mark_offset), swap_reg);
1109
1110 assert(lock_offset == 0,
1111 "displaced header must be first word in BasicObjectLock");
1112
1113 lock();
1114 cmpxchgptr(lock_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
1115 jcc(Assembler::zero, count_locking);
1116
1117 const int zero_bits = 7;
1118
1119 // Fast check for recursive lock.
1120 //
1121 // Can apply the optimization only if this is a stack lock
1122 // allocated in this thread. For efficiency, we can focus on
1123 // recently allocated stack locks (instead of reading the stack
1124 // base and checking whether 'mark' points inside the current
1125 // thread stack):
1126 // 1) (mark & zero_bits) == 0, and
1127 // 2) rsp <= mark < mark + os::pagesize()
1128 //
1129 // Warning: rsp + os::pagesize can overflow the stack base. We must
1130 // neither apply the optimization for an inflated lock allocated
1131 // just above the thread stack (this is why condition 1 matters)
1132 // nor apply the optimization if the stack lock is inside the stack
1133 // of another thread. The latter is avoided even in case of overflow
1134 // because we have guard pages at the end of all stacks. Hence, if
1135 // we go over the stack base and hit the stack of another thread,
1136 // this should not be in a writeable area that could contain a
1137 // stack lock allocated by that thread. As a consequence, a stack
1138 // lock less than page size away from rsp is guaranteed to be
1139 // owned by the current thread.
1140 //
1141 // These 3 tests can be done by evaluating the following
1142 // expression: ((mark - rsp) & (zero_bits - os::vm_page_size())),
1143 // assuming both stack pointer and pagesize have their
1144 // least significant bits clear.
1145 // NOTE: the mark is in swap_reg %rax as the result of cmpxchg
1146 subptr(swap_reg, rsp);
1147 andptr(swap_reg, zero_bits - (int)os::vm_page_size());
1148
1149 // Save the test result, for recursive case, the result is zero
1150 movptr(Address(lock_reg, mark_offset), swap_reg);
1151 jcc(Assembler::notZero, slow_case);
1152
1153 bind(count_locking);
1154 inc_held_monitor_count();
1155 }
1156 jmp(done);
1157
1158 bind(slow_case);
1159
1160 // Call the runtime routine for slow case
1161 call_VM_preemptable(noreg,
1162 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
1163 lock_reg);
1164 bind(done);
1165 }
1166 }
1167
1168
1169 // Unlocks an object. Used in monitorexit bytecode and
1170 // remove_activation. Throws an IllegalMonitorException if object is
1171 // not locked by current thread.
1172 //
1173 // Args:
1174 // rdx, c_rarg1: BasicObjectLock for lock
1175 //
1176 // Kills:
1177 // rax
1178 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, ... (param regs)
1179 // rscratch1 (scratch reg)
1180 // rax, rbx, rcx, rdx
1181 void InterpreterMacroAssembler::unlock_object(Register lock_reg) {
1182 assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1");
1183
1184 if (LockingMode == LM_MONITOR) {
1185 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg);
1186 } else {
1187 Label count_locking, done, slow_case;
1188
1189 const Register swap_reg = rax; // Must use rax for cmpxchg instruction
1190 const Register header_reg = c_rarg2; // Will contain the old oopMark
1191 const Register obj_reg = c_rarg3; // Will contain the oop
1192
1193 save_bcp(); // Save in case of exception
1194
1195 if (LockingMode != LM_LIGHTWEIGHT) {
1196 // Convert from BasicObjectLock structure to object and BasicLock
1197 // structure Store the BasicLock address into %rax
1198 lea(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset()));
1199 }
1200
1201 // Load oop into obj_reg(%c_rarg3)
1202 movptr(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset()));
1203
1204 // Free entry
1205 movptr(Address(lock_reg, BasicObjectLock::obj_offset()), NULL_WORD);
1206
1207 if (LockingMode == LM_LIGHTWEIGHT) {
1208 lightweight_unlock(obj_reg, swap_reg, header_reg, slow_case);
1209 } else if (LockingMode == LM_LEGACY) {
1210 // Load the old header from BasicLock structure
1211 movptr(header_reg, Address(swap_reg,
1212 BasicLock::displaced_header_offset_in_bytes()));
1213
1214 // Test for recursion
1215 testptr(header_reg, header_reg);
1216
1217 // zero for recursive case
1218 jcc(Assembler::zero, count_locking);
1219
1220 // Atomic swap back the old header
1221 lock();
1222 cmpxchgptr(header_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
1223
1224 // zero for simple unlock of a stack-lock case
1225 jcc(Assembler::notZero, slow_case);
1226
1227 bind(count_locking);
1228 dec_held_monitor_count();
1229 }
1230 jmp(done);
1231
1232 bind(slow_case);
1233 // Call the runtime routine for slow case.
1234 movptr(Address(lock_reg, BasicObjectLock::obj_offset()), obj_reg); // restore obj
1235 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg);
1236
1237 bind(done);
1238
1239 restore_bcp();
1240 }
1241 }
1242
1243 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp,
1244 Label& zero_continue) {
1245 assert(ProfileInterpreter, "must be profiling interpreter");
1246 movptr(mdp, Address(rbp, frame::interpreter_frame_mdp_offset * wordSize));
1247 testptr(mdp, mdp);
1248 jcc(Assembler::zero, zero_continue);
1249 }
1250
1251
1252 // Set the method data pointer for the current bcp.
1253 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() {
1254 assert(ProfileInterpreter, "must be profiling interpreter");
1255 Label set_mdp;
1256 push(rax);
1257 push(rbx);
1258
1259 get_method(rbx);
1260 // Test MDO to avoid the call if it is null.
1261 movptr(rax, Address(rbx, in_bytes(Method::method_data_offset())));
1262 testptr(rax, rax);
1263 jcc(Assembler::zero, set_mdp);
1264 // rbx: method
1265 // _bcp_register: bcp
1266 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rbx, _bcp_register);
1267 // rax: mdi
1268 // mdo is guaranteed to be non-zero here, we checked for it before the call.
1269 movptr(rbx, Address(rbx, in_bytes(Method::method_data_offset())));
1270 addptr(rbx, in_bytes(MethodData::data_offset()));
1271 addptr(rax, rbx);
1272 bind(set_mdp);
1273 movptr(Address(rbp, frame::interpreter_frame_mdp_offset * wordSize), rax);
1274 pop(rbx);
1275 pop(rax);
1276 }
1277
1278 void InterpreterMacroAssembler::verify_method_data_pointer() {
1279 assert(ProfileInterpreter, "must be profiling interpreter");
1280 #ifdef ASSERT
1281 Label verify_continue;
1282 push(rax);
1283 push(rbx);
1284 Register arg3_reg = c_rarg3;
1285 Register arg2_reg = c_rarg2;
1286 push(arg3_reg);
1287 push(arg2_reg);
1288 test_method_data_pointer(arg3_reg, verify_continue); // If mdp is zero, continue
1289 get_method(rbx);
1290
1291 // If the mdp is valid, it will point to a DataLayout header which is
1292 // consistent with the bcp. The converse is highly probable also.
1293 load_unsigned_short(arg2_reg,
1294 Address(arg3_reg, in_bytes(DataLayout::bci_offset())));
1295 addptr(arg2_reg, Address(rbx, Method::const_offset()));
1296 lea(arg2_reg, Address(arg2_reg, ConstMethod::codes_offset()));
1297 cmpptr(arg2_reg, _bcp_register);
1298 jcc(Assembler::equal, verify_continue);
1299 // rbx: method
1300 // _bcp_register: bcp
1301 // c_rarg3: mdp
1302 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp),
1303 rbx, _bcp_register, arg3_reg);
1304 bind(verify_continue);
1305 pop(arg2_reg);
1306 pop(arg3_reg);
1307 pop(rbx);
1308 pop(rax);
1309 #endif // ASSERT
1310 }
1311
1312
1313 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in,
1314 int constant,
1315 Register value) {
1316 assert(ProfileInterpreter, "must be profiling interpreter");
1317 Address data(mdp_in, constant);
1318 movptr(data, value);
1319 }
1320
1321
1322 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
1323 int constant) {
1324 assert(ProfileInterpreter, "must be profiling interpreter");
1325 Address data(mdp_in, constant);
1326 addptr(data, DataLayout::counter_increment);
1327 }
1328
1329
1330 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
1331 Register index,
1332 int constant) {
1333 assert(ProfileInterpreter, "must be profiling interpreter");
1334 Address data(mdp_in, index, Address::times_1, constant);
1335 addptr(data, DataLayout::counter_increment);
1336 }
1337
1338 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in,
1339 int flag_byte_constant) {
1340 assert(ProfileInterpreter, "must be profiling interpreter");
1341 int header_offset = in_bytes(DataLayout::flags_offset());
1342 int header_bits = flag_byte_constant;
1343 // Set the flag
1344 orb(Address(mdp_in, header_offset), header_bits);
1345 }
1346
1347
1348
1349 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in,
1350 int offset,
1351 Register value,
1352 Register test_value_out,
1353 Label& not_equal_continue) {
1354 assert(ProfileInterpreter, "must be profiling interpreter");
1355 if (test_value_out == noreg) {
1356 cmpptr(value, Address(mdp_in, offset));
1357 } else {
1358 // Put the test value into a register, so caller can use it:
1359 movptr(test_value_out, Address(mdp_in, offset));
1360 cmpptr(test_value_out, value);
1361 }
1362 jcc(Assembler::notEqual, not_equal_continue);
1363 }
1364
1365
1366 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
1367 int offset_of_disp) {
1368 assert(ProfileInterpreter, "must be profiling interpreter");
1369 Address disp_address(mdp_in, offset_of_disp);
1370 addptr(mdp_in, disp_address);
1371 movptr(Address(rbp, frame::interpreter_frame_mdp_offset * wordSize), mdp_in);
1372 }
1373
1374
1375 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
1376 Register reg,
1377 int offset_of_disp) {
1378 assert(ProfileInterpreter, "must be profiling interpreter");
1379 Address disp_address(mdp_in, reg, Address::times_1, offset_of_disp);
1380 addptr(mdp_in, disp_address);
1381 movptr(Address(rbp, frame::interpreter_frame_mdp_offset * wordSize), mdp_in);
1382 }
1383
1384
1385 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in,
1386 int constant) {
1387 assert(ProfileInterpreter, "must be profiling interpreter");
1388 addptr(mdp_in, constant);
1389 movptr(Address(rbp, frame::interpreter_frame_mdp_offset * wordSize), mdp_in);
1390 }
1391
1392
1393 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) {
1394 assert(ProfileInterpreter, "must be profiling interpreter");
1395 push(return_bci); // save/restore across call_VM
1396 call_VM(noreg,
1397 CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret),
1398 return_bci);
1399 pop(return_bci);
1400 }
1401
1402
1403 void InterpreterMacroAssembler::profile_taken_branch(Register mdp) {
1404 if (ProfileInterpreter) {
1405 Label profile_continue;
1406
1407 // If no method data exists, go to profile_continue.
1408 test_method_data_pointer(mdp, profile_continue);
1409
1410 // We are taking a branch. Increment the taken count.
1411 increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset()));
1412
1413 // The method data pointer needs to be updated to reflect the new target.
1414 update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset()));
1415 bind(profile_continue);
1416 }
1417 }
1418
1419
1420 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) {
1421 if (ProfileInterpreter) {
1422 Label profile_continue;
1423
1424 // If no method data exists, go to profile_continue.
1425 test_method_data_pointer(mdp, profile_continue);
1426
1427 // We are not taking a branch. Increment the not taken count.
1428 increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset()));
1429
1430 // The method data pointer needs to be updated to correspond to
1431 // the next bytecode
1432 update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size()));
1433 bind(profile_continue);
1434 }
1435 }
1436
1437 void InterpreterMacroAssembler::profile_call(Register mdp) {
1438 if (ProfileInterpreter) {
1439 Label profile_continue;
1440
1441 // If no method data exists, go to profile_continue.
1442 test_method_data_pointer(mdp, profile_continue);
1443
1444 // We are making a call. Increment the count.
1445 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1446
1447 // The method data pointer needs to be updated to reflect the new target.
1448 update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size()));
1449 bind(profile_continue);
1450 }
1451 }
1452
1453
1454 void InterpreterMacroAssembler::profile_final_call(Register mdp) {
1455 if (ProfileInterpreter) {
1456 Label profile_continue;
1457
1458 // If no method data exists, go to profile_continue.
1459 test_method_data_pointer(mdp, profile_continue);
1460
1461 // We are making a call. Increment the count.
1462 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1463
1464 // The method data pointer needs to be updated to reflect the new target.
1465 update_mdp_by_constant(mdp,
1466 in_bytes(VirtualCallData::
1467 virtual_call_data_size()));
1468 bind(profile_continue);
1469 }
1470 }
1471
1472
1473 void InterpreterMacroAssembler::profile_virtual_call(Register receiver,
1474 Register mdp,
1475 Register reg2,
1476 bool receiver_can_be_null) {
1477 if (ProfileInterpreter) {
1478 Label profile_continue;
1479
1480 // If no method data exists, go to profile_continue.
1481 test_method_data_pointer(mdp, profile_continue);
1482
1483 Label skip_receiver_profile;
1484 if (receiver_can_be_null) {
1485 Label not_null;
1486 testptr(receiver, receiver);
1487 jccb(Assembler::notZero, not_null);
1488 // We are making a call. Increment the count for null receiver.
1489 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1490 jmp(skip_receiver_profile);
1491 bind(not_null);
1492 }
1493
1494 // Record the receiver type.
1495 record_klass_in_profile(receiver, mdp, reg2, true);
1496 bind(skip_receiver_profile);
1497
1498 // The method data pointer needs to be updated to reflect the new target.
1499 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1500 bind(profile_continue);
1501 }
1502 }
1503
1504 // This routine creates a state machine for updating the multi-row
1505 // type profile at a virtual call site (or other type-sensitive bytecode).
1506 // The machine visits each row (of receiver/count) until the receiver type
1507 // is found, or until it runs out of rows. At the same time, it remembers
1508 // the location of the first empty row. (An empty row records null for its
1509 // receiver, and can be allocated for a newly-observed receiver type.)
1510 // Because there are two degrees of freedom in the state, a simple linear
1511 // search will not work; it must be a decision tree. Hence this helper
1512 // function is recursive, to generate the required tree structured code.
1513 // It's the interpreter, so we are trading off code space for speed.
1514 // See below for example code.
1515 void InterpreterMacroAssembler::record_klass_in_profile_helper(
1516 Register receiver, Register mdp,
1517 Register reg2, int start_row,
1518 Label& done, bool is_virtual_call) {
1519 if (TypeProfileWidth == 0) {
1520 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1521 } else {
1522 record_item_in_profile_helper(receiver, mdp, reg2, 0, done, TypeProfileWidth,
1523 &VirtualCallData::receiver_offset, &VirtualCallData::receiver_count_offset);
1524 }
1525 }
1526
1527 void InterpreterMacroAssembler::record_item_in_profile_helper(Register item, Register mdp, Register reg2, int start_row,
1528 Label& done, int total_rows,
1529 OffsetFunction item_offset_fn,
1530 OffsetFunction item_count_offset_fn) {
1531 int last_row = total_rows - 1;
1532 assert(start_row <= last_row, "must be work left to do");
1533 // Test this row for both the item and for null.
1534 // Take any of three different outcomes:
1535 // 1. found item => increment count and goto done
1536 // 2. found null => keep looking for case 1, maybe allocate this cell
1537 // 3. found something else => keep looking for cases 1 and 2
1538 // Case 3 is handled by a recursive call.
1539 for (int row = start_row; row <= last_row; row++) {
1540 Label next_test;
1541 bool test_for_null_also = (row == start_row);
1542
1543 // See if the item is item[n].
1544 int item_offset = in_bytes(item_offset_fn(row));
1545 test_mdp_data_at(mdp, item_offset, item,
1546 (test_for_null_also ? reg2 : noreg),
1547 next_test);
1548 // (Reg2 now contains the item from the CallData.)
1549
1550 // The item is item[n]. Increment count[n].
1551 int count_offset = in_bytes(item_count_offset_fn(row));
1552 increment_mdp_data_at(mdp, count_offset);
1553 jmp(done);
1554 bind(next_test);
1555
1556 if (test_for_null_also) {
1557 // Failed the equality check on item[n]... Test for null.
1558 testptr(reg2, reg2);
1559 if (start_row == last_row) {
1560 // The only thing left to do is handle the null case.
1561 Label found_null;
1562 jccb(Assembler::zero, found_null);
1563 // Item did not match any saved item and there is no empty row for it.
1564 // Increment total counter to indicate polymorphic case.
1565 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1566 jmp(done);
1567 bind(found_null);
1568 break;
1569 }
1570 Label found_null;
1571 // Since null is rare, make it be the branch-taken case.
1572 jcc(Assembler::zero, found_null);
1573
1574 // Put all the "Case 3" tests here.
1575 record_item_in_profile_helper(item, mdp, reg2, start_row + 1, done, total_rows,
1576 item_offset_fn, item_count_offset_fn);
1577
1578 // Found a null. Keep searching for a matching item,
1579 // but remember that this is an empty (unused) slot.
1580 bind(found_null);
1581 }
1582 }
1583
1584 // In the fall-through case, we found no matching item, but we
1585 // observed the item[start_row] is null.
1586
1587 // Fill in the item field and increment the count.
1588 int item_offset = in_bytes(item_offset_fn(start_row));
1589 set_mdp_data_at(mdp, item_offset, item);
1590 int count_offset = in_bytes(item_count_offset_fn(start_row));
1591 movl(reg2, DataLayout::counter_increment);
1592 set_mdp_data_at(mdp, count_offset, reg2);
1593 if (start_row > 0) {
1594 jmp(done);
1595 }
1596 }
1597
1598 // Example state machine code for three profile rows:
1599 // // main copy of decision tree, rooted at row[1]
1600 // if (row[0].rec == rec) { row[0].incr(); goto done; }
1601 // if (row[0].rec != nullptr) {
1602 // // inner copy of decision tree, rooted at row[1]
1603 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1604 // if (row[1].rec != nullptr) {
1605 // // degenerate decision tree, rooted at row[2]
1606 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1607 // if (row[2].rec != nullptr) { count.incr(); goto done; } // overflow
1608 // row[2].init(rec); goto done;
1609 // } else {
1610 // // remember row[1] is empty
1611 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1612 // row[1].init(rec); goto done;
1613 // }
1614 // } else {
1615 // // remember row[0] is empty
1616 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1617 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1618 // row[0].init(rec); goto done;
1619 // }
1620 // done:
1621
1622 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver,
1623 Register mdp, Register reg2,
1624 bool is_virtual_call) {
1625 assert(ProfileInterpreter, "must be profiling");
1626 Label done;
1627
1628 record_klass_in_profile_helper(receiver, mdp, reg2, 0, done, is_virtual_call);
1629
1630 bind (done);
1631 }
1632
1633 void InterpreterMacroAssembler::profile_ret(Register return_bci,
1634 Register mdp) {
1635 if (ProfileInterpreter) {
1636 Label profile_continue;
1637 uint row;
1638
1639 // If no method data exists, go to profile_continue.
1640 test_method_data_pointer(mdp, profile_continue);
1641
1642 // Update the total ret count.
1643 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1644
1645 for (row = 0; row < RetData::row_limit(); row++) {
1646 Label next_test;
1647
1648 // See if return_bci is equal to bci[n]:
1649 test_mdp_data_at(mdp,
1650 in_bytes(RetData::bci_offset(row)),
1651 return_bci, noreg,
1652 next_test);
1653
1654 // return_bci is equal to bci[n]. Increment the count.
1655 increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row)));
1656
1657 // The method data pointer needs to be updated to reflect the new target.
1658 update_mdp_by_offset(mdp,
1659 in_bytes(RetData::bci_displacement_offset(row)));
1660 jmp(profile_continue);
1661 bind(next_test);
1662 }
1663
1664 update_mdp_for_ret(return_bci);
1665
1666 bind(profile_continue);
1667 }
1668 }
1669
1670
1671 void InterpreterMacroAssembler::profile_null_seen(Register mdp) {
1672 if (ProfileInterpreter) {
1673 Label profile_continue;
1674
1675 // If no method data exists, go to profile_continue.
1676 test_method_data_pointer(mdp, profile_continue);
1677
1678 set_mdp_flag_at(mdp, BitData::null_seen_byte_constant());
1679
1680 // The method data pointer needs to be updated.
1681 int mdp_delta = in_bytes(BitData::bit_data_size());
1682 if (TypeProfileCasts) {
1683 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1684 }
1685 update_mdp_by_constant(mdp, mdp_delta);
1686
1687 bind(profile_continue);
1688 }
1689 }
1690
1691
1692 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) {
1693 if (ProfileInterpreter) {
1694 Label profile_continue;
1695
1696 // If no method data exists, go to profile_continue.
1697 test_method_data_pointer(mdp, profile_continue);
1698
1699 // The method data pointer needs to be updated.
1700 int mdp_delta = in_bytes(BitData::bit_data_size());
1701 if (TypeProfileCasts) {
1702 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1703
1704 // Record the object type.
1705 record_klass_in_profile(klass, mdp, reg2, false);
1706 }
1707 update_mdp_by_constant(mdp, mdp_delta);
1708
1709 bind(profile_continue);
1710 }
1711 }
1712
1713
1714 void InterpreterMacroAssembler::profile_switch_default(Register mdp) {
1715 if (ProfileInterpreter) {
1716 Label profile_continue;
1717
1718 // If no method data exists, go to profile_continue.
1719 test_method_data_pointer(mdp, profile_continue);
1720
1721 // Update the default case count
1722 increment_mdp_data_at(mdp,
1723 in_bytes(MultiBranchData::default_count_offset()));
1724
1725 // The method data pointer needs to be updated.
1726 update_mdp_by_offset(mdp,
1727 in_bytes(MultiBranchData::
1728 default_displacement_offset()));
1729
1730 bind(profile_continue);
1731 }
1732 }
1733
1734
1735 void InterpreterMacroAssembler::profile_switch_case(Register index,
1736 Register mdp,
1737 Register reg2) {
1738 if (ProfileInterpreter) {
1739 Label profile_continue;
1740
1741 // If no method data exists, go to profile_continue.
1742 test_method_data_pointer(mdp, profile_continue);
1743
1744 // Build the base (index * per_case_size_in_bytes()) +
1745 // case_array_offset_in_bytes()
1746 movl(reg2, in_bytes(MultiBranchData::per_case_size()));
1747 imulptr(index, reg2); // XXX l ?
1748 addptr(index, in_bytes(MultiBranchData::case_array_offset())); // XXX l ?
1749
1750 // Update the case count
1751 increment_mdp_data_at(mdp,
1752 index,
1753 in_bytes(MultiBranchData::relative_count_offset()));
1754
1755 // The method data pointer needs to be updated.
1756 update_mdp_by_offset(mdp,
1757 index,
1758 in_bytes(MultiBranchData::
1759 relative_displacement_offset()));
1760
1761 bind(profile_continue);
1762 }
1763 }
1764
1765
1766
1767 void InterpreterMacroAssembler::_interp_verify_oop(Register reg, TosState state, const char* file, int line) {
1768 if (state == atos) {
1769 MacroAssembler::_verify_oop_checked(reg, "broken oop", file, line);
1770 }
1771 }
1772
1773
1774 // Jump if ((*counter_addr += increment) & mask) == 0
1775 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr, Address mask,
1776 Register scratch, Label* where) {
1777 // This update is actually not atomic and can lose a number of updates
1778 // under heavy contention, but the alternative of using the (contended)
1779 // atomic update here penalizes profiling paths too much.
1780 movl(scratch, counter_addr);
1781 incrementl(scratch, InvocationCounter::count_increment);
1782 movl(counter_addr, scratch);
1783 andl(scratch, mask);
1784 if (where != nullptr) {
1785 jcc(Assembler::zero, *where);
1786 }
1787 }
1788
1789 void InterpreterMacroAssembler::notify_method_entry() {
1790 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to
1791 // track stack depth. If it is possible to enter interp_only_mode we add
1792 // the code to check if the event should be sent.
1793 Register rthread = r15_thread;
1794 Register rarg = c_rarg1;
1795 if (JvmtiExport::can_post_interpreter_events()) {
1796 Label L;
1797 movl(rdx, Address(rthread, JavaThread::interp_only_mode_offset()));
1798 testl(rdx, rdx);
1799 jcc(Assembler::zero, L);
1800 call_VM(noreg, CAST_FROM_FN_PTR(address,
1801 InterpreterRuntime::post_method_entry));
1802 bind(L);
1803 }
1804
1805 if (DTraceMethodProbes) {
1806 get_method(rarg);
1807 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
1808 rthread, rarg);
1809 }
1810
1811 // RedefineClasses() tracing support for obsolete method entry
1812 if (log_is_enabled(Trace, redefine, class, obsolete)) {
1813 get_method(rarg);
1814 call_VM_leaf(
1815 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
1816 rthread, rarg);
1817 }
1818 }
1819
1820
1821 void InterpreterMacroAssembler::notify_method_exit(
1822 TosState state, NotifyMethodExitMode mode) {
1823 // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to
1824 // track stack depth. If it is possible to enter interp_only_mode we add
1825 // the code to check if the event should be sent.
1826 Register rthread = r15_thread;
1827 Register rarg = c_rarg1;
1828 if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) {
1829 Label L;
1830 // Note: frame::interpreter_frame_result has a dependency on how the
1831 // method result is saved across the call to post_method_exit. If this
1832 // is changed then the interpreter_frame_result implementation will
1833 // need to be updated too.
1834
1835 // template interpreter will leave the result on the top of the stack.
1836 push(state);
1837 movl(rdx, Address(rthread, JavaThread::interp_only_mode_offset()));
1838 testl(rdx, rdx);
1839 jcc(Assembler::zero, L);
1840 call_VM(noreg,
1841 CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit));
1842 bind(L);
1843 pop(state);
1844 }
1845
1846 if (DTraceMethodProbes) {
1847 push(state);
1848 get_method(rarg);
1849 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
1850 rthread, rarg);
1851 pop(state);
1852 }
1853 }
1854
1855 void InterpreterMacroAssembler::load_resolved_indy_entry(Register cache, Register index) {
1856 // Get index out of bytecode pointer
1857 get_cache_index_at_bcp(index, 1, sizeof(u4));
1858 // Get address of invokedynamic array
1859 movptr(cache, Address(rbp, frame::interpreter_frame_cache_offset * wordSize));
1860 movptr(cache, Address(cache, in_bytes(ConstantPoolCache::invokedynamic_entries_offset())));
1861 if (is_power_of_2(sizeof(ResolvedIndyEntry))) {
1862 shll(index, log2i_exact(sizeof(ResolvedIndyEntry))); // Scale index by power of 2
1863 } else {
1864 imull(index, index, sizeof(ResolvedIndyEntry)); // Scale the index to be the entry index * sizeof(ResolvedIndyEntry)
1865 }
1866 lea(cache, Address(cache, index, Address::times_1, Array<ResolvedIndyEntry>::base_offset_in_bytes()));
1867 }
1868
1869 void InterpreterMacroAssembler::load_field_entry(Register cache, Register index, int bcp_offset) {
1870 // Get index out of bytecode pointer
1871 movptr(cache, Address(rbp, frame::interpreter_frame_cache_offset * wordSize));
1872 get_cache_index_at_bcp(index, bcp_offset, sizeof(u2));
1873
1874 movptr(cache, Address(cache, ConstantPoolCache::field_entries_offset()));
1875 // Take shortcut if the size is a power of 2
1876 if (is_power_of_2(sizeof(ResolvedFieldEntry))) {
1877 shll(index, log2i_exact(sizeof(ResolvedFieldEntry))); // Scale index by power of 2
1878 } else {
1879 imull(index, index, sizeof(ResolvedFieldEntry)); // Scale the index to be the entry index * sizeof(ResolvedFieldEntry)
1880 }
1881 lea(cache, Address(cache, index, Address::times_1, Array<ResolvedFieldEntry>::base_offset_in_bytes()));
1882 }
1883
1884 void InterpreterMacroAssembler::load_method_entry(Register cache, Register index, int bcp_offset) {
1885 // Get index out of bytecode pointer
1886 movptr(cache, Address(rbp, frame::interpreter_frame_cache_offset * wordSize));
1887 get_cache_index_at_bcp(index, bcp_offset, sizeof(u2));
1888
1889 movptr(cache, Address(cache, ConstantPoolCache::method_entries_offset()));
1890 imull(index, index, sizeof(ResolvedMethodEntry)); // Scale the index to be the entry index * sizeof(ResolvedMethodEntry)
1891 lea(cache, Address(cache, index, Address::times_1, Array<ResolvedMethodEntry>::base_offset_in_bytes()));
1892 }